This "feature" is unfortunately the result of the WebIDL definition of "dictionary", where members that are not known to the implementation are ignored by definition - it is *specified* to act as if they don't exist. Closing as "working as intended", even though I agree with you that this will surprise users. (Note: The reason why MediaTrackSupportedConstraints exists is exactly the same problem.) -- GitHub Notification of comment by alvestrand Please view or discuss this issue at https://github.com/w3c/webrtc-pc/issues/1882#issuecomment-393735578 using your GitHub accountReceived on Friday, 1 June 2018 01:58:28 UTC
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